What are catalysts?
2 marks · HardExplain why the same catalyst cannot usually be used for every type of chemical reaction.
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Also accept: Different reactions require different catalysts; Catalysts are usually reaction-specific
Common mistakes: Saying all reactions need the same catalyst; Ignoring specificity
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Marking points
B1 · 1 mark · Identifies that catalysts are usually specific to particular reactions.
B2 · 1 mark · States that different reactions need different catalysts, or explains why catalysts do not work for all reactions.
Worked solution
Catalysts are usually specific to a particular reaction. Different reactions require different catalysts to work effectively.